Можно ли облегчить наш труд... или опыт и практика

[belugin]

This message was created automatically by mail delivery
software.

A message that you sent could not be delivered to one or
more of its
recipients. This is a permanent error. The following
address(es) failed:

Mazzy@mazzy.ru
SMTP error from remote mailer after RCPT
TO:<Mazzy@mazzy.ru>:
host MAIL.mazzy.ru [81.176.66.73]: 550 5.7.1
<Mazzy@mazzy.ru>... Relaying denied. Proper authentication
required.

------ This is a copy of the message, including all the
headers. ------